OK. I understand now. The pages you're referring to are the legacy Mango interface... the dropdowns on those pages. If I understand correctly, these are the pages generated by .jsp and use Dojo as they are pre-AngJS..
No problems at all.. pages respond well, drop downs populate quickly, allow selection and redirect based on selection.
For historical reference, I am using:
ii lightdm 1.10.3-3
ii lightdm-gtk-greeter 1.8.5-2
ii task-desktop 3.31+deb8u1
ii task-xfce-desktop 3.31+deb8u1
ii tasksel 3.31+deb8u1
ii tasksel-data 3.31+deb8u1
ii xfce4 4.10.1 all
ii iceweasel 52.2.0esr-1~ all
I omitted a bulk of the output from
but I am happy to send it.